Bump the test-packages group with 1 update (#44)

Bumps NUnit3TestAdapter from 6.0.0 to 6.1.0

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-packages
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Directory.Packages.props

@@ -18,7 +18,7 @@
     <!-- Testing -->
     <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
-    <PackageVersion Include="NUnit3TestAdapter" Version="6.0.0" />
+    <PackageVersion Include="NUnit3TestAdapter" Version="6.1.0" />
     <PackageVersion Include="FluentAssertions" Version="8.8.0" />
     <PackageVersion Include="coverlet.collector" Version="6.0.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.1" />